KR100407960B1 - oil suppling apparatus for compressor in the refrigerator - Google Patents

Abstract

The present invention relates to a compressor for a cold container, and more particularly, to an oil supply apparatus of a compressor for a cold container which can smoothly supply refrigeration oil even at a low speed in a reciprocating compressor that performs both a low speed operation and a high speed operation. will be.

To this end, the present invention is a cylindrical piece 130 is fixed to the lower end of the crankshaft 110 and rotated together during the rotation of the crankshaft; A propeller 132 installed inside the piece to allow oil to rise by relative movement with the piece; Fixed to the lower end of the propeller oil supply apparatus of the compressor for a cold container consisting of a rotation preventing means for preventing the propeller is rotated.

Description

Oil suppling apparatus for compressor in the refrigerator}

The present invention relates to a compressor for a cold container, and more particularly, to an oil supply apparatus of a compressor for a cold container, in which a compressor which performs both a low speed operation and a high speed operation can supply sufficient refrigeration oil even at a low speed operation.

In general, a compressor for a cold container serves to supply a refrigerant to a condenser by compressing a working fluid passing through an evaporator in a refrigerating air conditioner such as a refrigerator or an air conditioner.

Hereinafter, a configuration of a reciprocating compressor among compressors for a general cold application container will be described in detail with reference to FIGS. 1 to 3B.

1 is a schematic view showing the overall structure of a conventional compressor for a cold container. Referring to this, the reciprocating compressor is mounted in an enclosed space consisting of a lower shell 2 and an upper shell 1.

The compressor includes a transmission unit for generating a rotational force as a current is applied, a compression unit for compressing a working fluid by the rotational force of the transmission unit, and refrigeration oil to reduce friction and to cool heat generated in the mechanism. It consists of an oil supply part to supply.

The transmission unit is composed of a stator 21 for generating an electromagnetic force by applying a current, and a rotor 22 for generating a rotational force by the electromagnetic force of the stator.

The compression section includes a connecting rod 31 for converting a rotational motion into a linear reciprocating motion, and a piston 32 for compressing a working fluid in the cylinder block by the connecting rod.

In addition, the oil supply portion is composed of a crankshaft 110 and the oil supply device 120, the connecting rod 31 is one end of the pin is coupled to the eccentric portion 111 formed on the upper end of the crankshaft, the other end It is pinned to this piston 32.

Accordingly, the connecting rod 31 converts the rotational movement of the crankshaft into a linear reciprocating movement of the piston 32.

On the other hand, the refrigeration oil is accumulated in the oil plate (not shown) positioned inside the lower shell 2, and the lower end of the oil supply device 120 is immersed in the refrigeration oil.

One side of the lower shell 2 is provided with a hermetic terminal 11 and a cluster 12 to connect the stator 21 to an external power source.

A plurality of lead wires 13 branched from the stator 21 are fixed to the cluster 12 by terminals (not shown), and a plurality of pins penetrating through the hermetic terminal 11 are coupled to the terminals.

Hereinafter, referring to FIG. 2 to FIG. 3B, the oil supply unit is as follows.

FIG. 2 is a front view illustrating an oil supply unit of the compressor for a cold container of FIG. 1, and FIG. 3A is a cross-sectional view illustrating a piece press-fitted to the lower end of the crankshaft of FIG. 2, and FIG. 3B is a view illustrating the oil supply device of FIG. 2. The front view which showed the propeller inserted and mounted in the inside of a piece.

The oil supply unit 100 is largely composed of a crankshaft 110 and an oil supply device 120.

The crankshaft 110 has an eccentric portion 111 installed to be axial and eccentric, a weight balance 112 provided at the lower end of the eccentric portion 111 to prevent vibration during rotation, and the weight balance 112 Is fixed to the lower end of the shaft portion 113 is provided with a rising flow path of the refrigeration oil.

At this time, the oil hole 113b is formed in the middle portion of the longitudinal direction of the shaft portion 113 so as to communicate with the outside, and extends from the oil hole 113b to the eccentric portion 111 located at the top of the crankshaft shaft portion ( A spiral oil groove 113a is formed along the outer circumferential surface of the 113.

In addition, the drill hole 113c communicating with the oil hole 113b is formed in the longitudinal direction of the shaft portion 113 and eccentrically with respect to the rotation axis of the shaft portion 113.

Accordingly, when the crankshaft is rotated, the refrigerant oil introduced into the drill hole 113c by the centrifugal force of the oil supply device 120 flows through the oil hole 113b to the oil groove 113a and the oil groove. The refrigeration oil which has reached the eccentric part 111 through 113a is scattered to the mechanism part.

The refrigeration oil scattered as described above functions to lubricate the compressor and simultaneously absorb heat generated during operation of the compressor to prevent the compressor from being damaged by high heat and friction.

In addition, a gas hole 113d is formed in one side surface of the drill hole 113c at a distance from the circumferential surface of the shaft portion 113 to discharge the gas. Gas generated during the flow to the outside of the crankshaft 110 is discharged.

On the other hand, the oil supply device 120 is a device for pumping the refrigeration oil using a centrifugal force, the cylindrical piece 131 is inserted into the lower end of the shaft portion 113 of the crankshaft 110 and is inserted into the piece It consists of a propeller 122 which forms the flow path of the refrigeration oil.

The oil supply device 120 configured as described above is provided at the lower end of the rotating crank shaft 110 to rotate together with the crank shaft.

At this time, the refrigeration oil is pumped to the drill hole (113c) while flowing upward through the propeller of the oil supply device 120 by centrifugal force, and then continues to flow to the oil groove (113a) through the oil hole (113b). do.

Subsequently, the refrigerator oil lubricates the journal bearing (not shown) while flowing upward along the oil groove 113a, and eventually moves to the eccentric portion 111 and is scattered to the mechanism part in the shells 1 and 2.

The refrigeration oil scattered in this way is recovered again by the oil plate located at the bottom.

However, in recent years, a pole conversion motor or a BLDC motor capable of performing both a low speed operation and a high speed operation in order to reduce power consumption of a cold container product has been widely applied as a motor of a compressor.

However, the above oil supply apparatus is for high speed operation (approximately 3600 rpm), and there is a problem in that refrigeration oil supply is not smooth during low speed operation (approximately 1800 rpm).

That is, the refrigeration oil is moved upward by the centrifugal force due to the rotational movement of the oil supply device. When the compressor is rotated at a low speed, the centrifugal force decreases rapidly, and thus refrigeration oil cannot be properly supplied.

Accordingly, the compressor has a reduced function of dissipating heat generated during low speed operation and at the same time, as the supply of the refrigeration oil is reduced, the wear of the mechanism increases, so the life of the compressor is significantly reduced and the noise is increased.

In order to solve the above problems, it is an object of the present invention to provide an oil supply apparatus of a compressor for a cold container to smoothly supply the refrigeration oil during low-speed operation of the compressor.

1 is a schematic diagram showing the overall structure of a conventional cold container compressor.

2 is a front view showing an oil supply unit of the compressor for a cold container of FIG.

3A is a cross-sectional view of a piece press-fit fixed to the lower end of the crankshaft of FIG.

3B is a front view of the propeller inserted into the piece, showing the oil supply device of FIG.

4 is a sectional view showing an oil supply unit of a compressor for a cold container according to the present invention.

5 is a front view showing a second embodiment of the oil supply device according to the present invention.

6 is a front view showing a third embodiment of the oil supply device according to the present invention.

Figure 7 is a side view showing the anti-rotation part of FIG.

Explanation of symbols on the main parts of the drawings

100: oil supply unit 110: crankshaft

111: eccentric 112: weight balance

113: shaft 130: oil supply device

131: piece 132: propeller

132a: helical groove 133: elastic member

133a: holder 133b: extension

134a: first extension 134b: second extension

135: fixed rod 135a: bent portion

140: Dish collecting dish 141: Anti-rotation part

141a: grip

To this end, the present invention is a cylindrical piece that is fixed to the lower end of the crankshaft to rotate together with the rotation of the crankshaft; A propeller installed inside the piece to allow oil to rise by relative movement with the piece; It is fixed to the lower end of the propeller provides an oil supply device of the compressor for a cold container consisting of a rotation preventing means for preventing the propeller is rotated.

The same parts as in the related art with respect to the compressor for a cold container according to the present invention will be given the same reference number, and the description thereof will be omitted.

Hereinafter, the compressor for a cold container according to the present invention will be described in detail with reference to FIGS. 4 to 7.

4 is a cross-sectional view illustrating an oil supply unit of a compressor for a cold container according to the present invention, and referring to this, the oil supply unit 100 of the compressor for a cold container consists of a crank shaft 110 and an oil supply device 130. The crankshaft 110 includes an eccentric part 111, a weight balance 112, and an axial part 113.

The crankshaft is press-fitted to the center of the rotor 22 and rotated as the rotor is rotated.

An oil supply device 130 is installed at the lower end of the crankshaft. The oil supply device includes a piece 131, a propeller 132, and an anti-rotation means.

The piece 131 is press-fitted to the lower end of the shaft portion 113, and both ends thereof are open and a cylindrical hollow is formed at the center thereof.

At this time, the propeller 132 is mounted inside the piece 131 such that its inner circumferential surface and the outer circumferential surface of the piece 131 have a predetermined clearance.

A plurality of helical grooves 132a extending spirally from the lower end to the upper end thereof are formed on the outer circumferential surface of the propeller 132 installed as described above. In order to optimize the fluidity of the refrigeration oil, two or three helical grooves are formed on the propeller 132. It is most preferable to form 132a.

Of course, instead of forming a helical groove on the outer circumferential surface of the propeller, a helical groove may be formed on the inner circumferential surface of the piece.

On the other hand, the lower end of the propeller 132 is fixed to the anti-rotation means, the anti-rotation means is an elastic member 133, one end is fixed to the lower end of the propeller, and the anti-rotation portion 141 to prevent the rotation of the elastic member )

At this time, a fastening portion may be formed at the lower end of the propeller 132 to insert and fix the upper end of the elastic member 133.

In addition, the anti-rotation part is formed to protrude from the dish collecting dish 140 installed in the lower portion of the elastic member.

As described above, since the propeller 132 and the piece 131 are installed to have a predetermined gap and the bottom thereof is fixed by the elastic member 133, the propeller 132 is not rotated even when the piece 131 is rotated. Do not.

Meanwhile, the propeller and the piece may be damaged as the rotating shaft of the piece 131 is shaken by the external force or the external vibration while the piece 131 rotates. For this purpose, the elastic member 133 may be formed of the piece 131. It is preferred to use coil springs that are elastically outward with respect to the axis of rotation.

In addition, in order to be able to absorb the vibration generated in the direction of the rotation axis of the propeller 132 to a larger range by the refrigeration oil flowing upward through the helical groove 132a while the piece 131 rotates, the elastic member More preferably, 133 is a conical coil spring having a diameter of the upper portion smaller than the lower portion.

The elastic means 133 having such a shape is fixed to the lower end of the propeller 132 to have the same spiral direction as the rotation direction of the piece 131 when viewed from the bottom of the elastic means.

Accordingly, since the elastic means 133 is subjected to the tightening force while the piece 131 is rotated, it is possible to prevent the propeller 132 from being removed from the elastic member 133.

In addition, the elastic member 133 fixed to the propeller 132 has a diameter of wire smaller than that of the compressor support spring 3 shown in FIG. 1 to reduce the vibration generated in the compressor while supporting the mechanism part of the compressor from below. It is preferable to be installed to have).

This is to minimize the vibration on the elastic member 133 fixed to the propeller 132 even if the vibration of the compressor is severely affecting the elastic member 133 fixed to the propeller 132.

On the other hand, the piece 131 is formed with an annular rib 131a protruding outward along the lower end of the outer circumferential surface, which is the lower end of the piece 131 when the piece 131 is pressed into the lower end of the shaft 113 This is to prevent crushing.

In addition, by forming a holder 133a corresponding to the rib 131a at one end of the elastic member 133, and fastening the holder 133a to the rib 131a to fix the elastic member 133. The propeller 132 fixed to the upper end of the 133 can be more stably fixed.

At this time, the holder 133a should not be rotated when the rib 131a is rotated so that the holder has a predetermined clearance when the holder is fastened to the rib.

Accordingly, the holder preferably has a "c" shape to prevent it from being removed from the rib 131a.

Since the lower portion of the oil supply device installed as described above is immersed in the refrigerator oil, noise is hardly generated even when the rib 131a rotates and contacts the holder 133a.

The elastic means 133 may have its lower end fixed to the sewage dish 140, but below, an embodiment in which the elastic means is fixed to the sewage dish 140 will be described.

The elastic means has an extension portion 133b extending outward at its lower end, and a rotation preventing portion 141 is installed at the waste dish dish 140 to support the extension portion 133b.

At this time, the extension portion 133b is formed to have a "-" shape outward with respect to the spiral direction of the coil spring.

It is understood that the anti-rotation part 141 formed as described above may only function to support the extension part 133b or press-fix the extension part 133b.

Since the oil supply device 130 installed as described above has a structure in which the propeller 132 is not rotated when the piece 131 is rotated, the propeller is relatively moved as the piece 131 is rotated.

The freezer oil flows upward through the helical groove 132a due to the centrifugal force generated by the relative movement of the piece 131 and the propeller 132 and the viscosity of the freezer oil.

Subsequently, the refrigeration oil introduced into the drill hole 113c through the helical groove 132a reaches the oil hole 113b and continues to the eccentric portion 111 while lubricating the journal bearing located outside the shaft 113. After moving, it is scattered to the mechanism part.

Accordingly, a sufficient amount of refrigeration oil can flow through the helical groove 132a even at a low speed operation of the compressor.

5 is a front view showing a second embodiment of the oil supply apparatus according to the present invention with reference to this as follows.

In the oil supply apparatus according to the second embodiment of the present invention, the piece and the propeller have the same structure and operation as described above in the first embodiment, and will be omitted below. Only the features of the second embodiment will be described below. Let's do it.

An elastic means having an upper end fixed to the lower end of the propeller has an extension part 133b extending from the lower end of the propeller, wherein the extension part 133b has a first extension part 134a extending outward and the first extension part. It consists of a second extension portion 134b that is bent back to the lower portion of the first extension portion 134a by drawing an arc at the outer end of the portion 134a.

In this way, the second extension part 134b is supported by the anti-rotation part 141 protruding upward from the dish holder 140 so that the elastic means 133 is rotated while the piece 131 is being rotated. Prevent rotation.

In addition, the first and second extensions 134a and 134b more extensively absorb vibrations transmitted by the propeller 132 while the piece 131 is rotated.

Figure 6 is a front view showing a third embodiment of the oil supply apparatus according to the present invention, Figure 7 is a side view showing the grip formed on the anti-rotation portion of FIG.

In the oil supply apparatus according to the third embodiment of the present invention, the propeller 132 has the same structure and operation as described above in the first embodiment, and will be omitted below and only the features of the third embodiment will be described. Let's do it.

6 and 7, a piece is press-fitted to the lower end of the crankshaft. The piece has a cylindrical outer circumferential surface which does not have ribs protruding below the outer circumferential surface unlike the first and second embodiments of the present invention. Have

A fixing rod 135 is inserted into and fixed to a lower end of the propeller 132, and the fixing rod 135 has a shape in which one end thereof is bent perpendicularly to the longitudinal direction of the fixing rod 135.

In addition, the dirt collecting dish 140 is formed with a protruding rotation preventing portion 141.

When the anti-rotation part 141 is viewed from the side, as shown in FIG. 7, one end of the anti-rotation part 141 has a grip 141a (grip) having an “c” shape in which an open portion faces downward. Is formed.

Meanwhile, the propeller 132 fixed to the fixing rod 135 is fixed to a fixed position by inserting and fixing the other end of the fixing rod 135 to the grip 141a of the rotation preventing portion 141.

In this manner, after the propeller 132 is fixed, the compressor is seated while the piece 131 is inserted into the propeller 132.

When the compressor is seated, the bent portion 135a of the fixing rod 135 presses the outer circumferential surface of the lower end of the piece 131.

Subsequently, when the piece 131 is rotated, the other end of the fixing rod 135 is removed from the grip 141a by pressing the fixing rod.

As such, even when the fixing rod 135 is pulled out of the grip 141a, the propeller 132 may be prevented from being rotated by the anti-rotation unit 141 formed in the dish collecting dish.

In addition, since the refrigeration oil that rises while generating a centrifugal force exists between the propeller 132 and the piece 131 when the piece 131 is rotated, a predetermined gap is formed between the propeller 132 and the piece 131. Are maintained and do not rub against each other.

Accordingly, due to the centrifugal force generated by the relative rotational movement between the propeller 132 and the piece 131 and the viscosity of the refrigeration oil, a sufficient amount of the refrigeration base oil can be supplied even at low speed operation of the compressor.

In addition, it is possible to prevent the compressor from being damaged by the temperature rise while preventing the wear of the compressor even at a low speed operation of the compressor.

As described above, the present invention can supply a sufficient amount of refrigeration oil to the eccentric portion of the upper end of the shaft even in the low-speed operation in the reciprocating compressor that combines the high speed operation and the low speed operation.

Accordingly, it is possible to prevent wear of various components provided in the compressor and to dissipate heat generated from the mechanism part, thereby improving the reliability of the compressor.

Claims (19)

A cylindrical piece fixed to the lower end of the crankshaft and rotating together when the crankshaft rotates; A propeller installed inside the piece to allow oil to rise by relative movement with the piece; Fixed to the lower end of the propeller oil supply apparatus of the compressor for a cold container consisting of a rotation preventing means for preventing the propeller is rotated. The method of claim 1, The anti-rotation means is an oil supply device of a compressor for a cold container, characterized in that consisting of an elastic member having one end fixed to the lower end of the propeller, and an anti-rotation part for preventing rotation of the elastic member. The method of claim 2, The anti-rotation unit is an oil supply device of a compressor for a cold container, characterized in that formed to protrude on the dish dish installed in the lower portion of the elastic member. The method of claim 1, Oil supply device of the compressor for a cold container, characterized in that the helical groove is formed on the inner peripheral surface of the piece or the outer peripheral surface of the propeller. The method of claim 4, wherein Oil supply device of the compressor for a cold container, characterized in that a plurality of the helical groove is formed. The method of claim 4, wherein Oil supply device of the compressor for a cold container, characterized in that the helical groove is formed two or three. The method of claim 2, The elastic member is an oil supply device of a compressor for a cold container, characterized in that the coil spring. The method of claim 7, wherein The coil spring is an oil supply device of a compressor for a cold container, characterized in that the conical coil spring of which the lower diameter of the spiral is larger than the upper diameter. The method of claim 7, wherein The coil spring is installed to have the same spiral direction as the rotational direction of the piece when viewed from the lower end of the coil spring, thereby preventing the propeller fixed to the spring from being removed from the piece by allowing the spring to be tightened while the piece is rotated. Oil supply device of the compressor for cold applications, characterized in that. The method of claim 7, wherein The coil spring has a smaller diameter than the compressor support spring installed in the lower portion of the compressor to absorb the vibration generated by the rotation of the compressor oil supply device of the compressor for cold applications. The method according to any one of claims 7 to 10, The lower end of the coil spring is formed with an extension extending outward, the oil supply device of the compressor for a cold container, characterized in that the coil spring is prevented from rotating by being supported by the rotation preventing portion. The method of claim 11, The oil supply device of the compressor for a cold container, characterized in that the extension is "-" shape. The method of claim 11, The extension portion is composed of a first extension portion extending outward a predetermined distance and a second extension portion that is bent at the end of the first extension portion and extends again to the lower portion of the coil spring. Oil supply device of the compressor for cold applications. The method of claim 1, The piece is an oil supply apparatus of a compressor for a cold container, characterized in that an annular rib protruding outward along the lower end of the outer circumference is formed to prevent the lower end from being crushed when the piece is press-fitted to the lower end of the crankshaft. The method according to any one of claims 7 to 10, A holder is formed at one end of the elastic member so as to be installed on the rib of the piece, thereby preventing the propeller from being removed from the piece when the piece is rotated. The method of claim 15, The holder is an oil supply device of a compressor for a cold container, characterized in that the "c" shape so as to correspond to the rib. The method of claim 1, The anti-rotation means includes a fixed rod having one end fixed to the lower end of the propeller; Oil supply device of the compressor for a cold container, characterized in that made of a rotation preventing portion for supporting the fixing rod to prevent the fixed rod is rotated. The method of claim 17, The anti-rotation unit is an oil supply device of a compressor for a cold container, characterized in that formed to protrude on the dish dish installed in the lower portion of the elastic member. The method of claim 18, One end of the anti-rotation part is provided with a grip having an open shape toward the bottom of the "c" shape, inserting a fixed rod into the grip, and then seating the mechanical part of the compressor. An oil supply device for a compressor for a cold container, characterized in that the separation from the piece is prevented.